CN-122013225-A - Nickel-iron-cobalt catalyst for AEM water electrolysis hydrogen production and preparation method and application thereof

CN122013225ACN 122013225 ACN122013225 ACN 122013225ACN-122013225-A

Abstract

The invention provides a nickel-iron-cobalt catalyst for AEM water electrolysis hydrogen production, and a preparation method and application thereof. The preparation method of the nickel-iron-cobalt catalyst for AEM electrolytic water hydrogen production comprises the steps of S1, dissolving nickel salt in water to obtain nickel-containing solution, dissolving ferric salt in water to obtain iron-containing solution, dissolving cobalt salt in water to obtain cobalt-containing solution, dissolving sodium borohydride in water to obtain sodium borohydride solution, S2, uniformly mixing the nickel-containing solution, the iron-containing solution and the cobalt-containing solution to obtain mixed solution, S3, mixing and stirring the mixed solution and the sodium borohydride solution to generate a large amount of precipitates, and further cleaning, drying and grinding the precipitates to obtain the nickel-cobalt-iron oxygen evolution catalyst. The nickel-iron-cobalt catalyst provided by the invention can replace iridium oxide (ruthenium) catalyst. The catalyst has lower overpotential when applied to AEM water electrolysis hydrogen production, can ensure long-time effective electrolysis reaction, and simultaneously obviously reduces the cost of an AEM electrolytic tank.

Inventors

CAI JINGUANG
LI QIN
LV CHAO
LIU SIYI
ZENG NING
ZHANG ZEZHENG
YANG LIUXIN

Assignees

中国工程物理研究院材料研究所

Dates

Publication Date: 20260512
Application Date: 20260310

Claims (10)

1. A method for preparing a nickel-iron-cobalt catalyst for producing hydrogen by AEM electrolysis of water, which is characterized by comprising the following steps: S1, dissolving nickel salt in water to obtain a nickel-containing solution, dissolving ferric salt in water to obtain an iron-containing solution, dissolving cobalt salt in water to obtain a cobalt-containing solution, and dissolving sodium borohydride in water to obtain a sodium borohydride solution; s2, uniformly mixing a nickel-containing solution, an iron-containing solution and a cobalt-containing solution to obtain a mixed solution; and S3, mixing and stirring the mixed solution and the sodium borohydride solution to generate a large amount of precipitates, and further cleaning, drying and grinding the precipitates to obtain the nickel-cobalt-iron oxygen evolution catalyst.
2. The preparation method of claim 1, wherein the molar ratio of nickel element, iron element and cobalt element in the mixed solution is 1:1:1 to (1-10): 1-9): 1-8.
3. The preparation method according to claim 1, wherein in the step S2, ultrasonic dispersion is adopted for mixing, and the ultrasonic dispersion time is 1-120 min.
4. The method according to claim 1, wherein in the step S3, the mixing and stirring are magnetic stirring, mechanical stirring or ultrasonic mixing.
5. The preparation method according to claim 1, wherein the nickel salt, iron salt, cobalt salt is one or more selected from the group consisting of chloride, nitrate, sulfate and acetate.
6. The nickel-iron-cobalt catalyst for AEM water electrolysis hydrogen production is characterized in that the nickel-iron-cobalt catalyst for AEM water electrolysis hydrogen production is prepared by the preparation method of any one of claims 1-5.
7. The nickel iron cobalt catalyst for the production of hydrogen by AEM electrolysis of water of claim 6 in which the iron cobalt nickel catalyst is a uniformly dispersed nanoparticle.
8. The nickel-iron-cobalt catalyst for producing hydrogen by AEM electrolysis of water according to claim 6, wherein the average particle size of the nickel-iron-cobalt catalyst is 10-30 nm.
9. Use of a nickel iron cobalt catalyst according to any of claims 6-8 in the electrolysis of water to produce hydrogen using an anion exchange membrane.
10. The use according to claim 9, wherein the temperature of the energized electrolysis is 30-90 o C and the current of the electrolysis is 0.1-3 a/cm 2 .

Description

Nickel-iron-cobalt catalyst for AEM water electrolysis hydrogen production and preparation method and application thereof Technical Field The invention relates to the technical field of catalysts, in particular to a nickel-iron-cobalt catalyst for AEM water electrolysis hydrogen production, a preparation method and application thereof. Background Hydrogen has wide application in energy, industry, national defense, scientific research, medical treatment and the like. However, fossil fuel hydrogen production consumes non-renewable energy and is unfavorable for sustainable development. Most of renewable energy sources are converted into electric energy, such as wind power generation, solar power generation and the like, and the electric energy generated by the clean energy sources can be used for preparing hydrogen by electrolyzing water to prepare hydrogen. There are four methods of water electrolysis hydrogen production reported at present, such as alkaline water electrolysis hydrogen production (ALK), proton exchange membrane water electrolysis hydrogen Production (PEM), anion exchange membrane water electrolysis hydrogen production (AEM), solid oxide water electrolysis hydrogen production (SOEC), etc. However, only ALK and PEM are currently used for hydrogen production by water electrolysis on an industrial scale, balancing the various metrics of economic cost, hydrogen purity, and energy consumption. However, ALK produces hydrogen with low purity and high energy consumption, stable power supply is needed, the response speed is low, and the risk of alkali liquor leakage is also faced, so that the ALK does not meet the requirements of environmental protection. The anode of PEM electrolysers is in a strongly acidic environment and most non-noble metals can be corroded causing damage to the electrolyser. The oxygen evolution electrocatalyst and the electrode material of the anode must have high stability and acid resistance. Titanium is generally used as the electrode material and iridium as the noble metal catalyst. Iridium reserves are rare and expensive. AEM electrolyzed water technology combines the advantages of ALK and PEM technologies, and has been widely studied due to the advantages of low cost, high current density, high hydrogen purity, fast response speed, safety, etc. However, at present, the common anode catalyst of AEM electrolyzed water is iridium oxide and ruthenium oxide catalyst, the reserves of noble metal iridium and ruthenium are less, the price is high, and the stability of the AEM electrolyzed water in hydrogen production is lower. Therefore, development of a low-cost high-stability non-noble metal-based catalyst is needed to realize low-cost large-scale green application of AEM water electrolysis hydrogen production, and promote sustainable development of renewable energy hydrogen production industry. Disclosure of Invention Aiming at the problems of high cost and low stability of the existing noble metal catalyst, the invention provides a nickel-iron-cobalt catalyst for producing hydrogen by AEM water electrolysis and a preparation method and application thereof. The technical method of the invention is as follows: A preparation method of a nickel-iron-cobalt catalyst for AEM water electrolysis hydrogen production comprises the following steps: S1, dissolving nickel salt in water to obtain a nickel-containing solution, dissolving ferric salt in water to obtain an iron-containing solution, dissolving cobalt salt in water to obtain a cobalt-containing solution, and dissolving sodium borohydride in water to obtain a sodium borohydride solution; s2, uniformly mixing a nickel-containing solution, an iron-containing solution and a cobalt-containing solution to obtain a mixed solution; and S3, mixing and stirring the mixed solution and the sodium borohydride solution to generate a large amount of precipitates, and further cleaning, drying and grinding the precipitates to obtain the nickel-cobalt-iron oxygen evolution catalyst. Optionally, in the mixed solution, the molar ratio of the nickel element to the iron element to the cobalt element is 1:1:1 to (1-10): (1-9): (1-8). The nickel salt, the iron salt and the cobalt salt are selected from one or more of chloride, nitrate, sulfate and acetate. The average particle size of the nickel-iron-cobalt catalyst is 10-30 nm. Optionally, in the step S2, ultrasonic dispersion is adopted for mixing, and the time of ultrasonic dispersion is 1-120 min. Optionally, in the step S3, the mixing and stirring are magnetic stirring, mechanical stirring or ultrasonic mixing. The invention provides a nickel-iron-cobalt catalyst for AEM water electrolysis hydrogen production, which is prepared by the preparation method. Optionally, the iron cobalt nickel catalyst is a uniformly dispersed nanoparticle. The invention also provides application of the nickel-iron-cobalt catalyst in preparing hydrogen by electrolyzing water through an anion exchange membrane. Further,